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Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 2,657 $ 2,759  
Financing Receivable, Recorded Investment, Current 116,214 116,185  
Loans and Leases Receivable, Gross 118,871 118,944 $ 114,959
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,617 2,749  
Financing Receivable, Recorded Investment, Current 76,475 74,094  
Loans and Leases Receivable, Gross 79,092 76,843  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,417 2,580  
Financing Receivable, Recorded Investment, Current 64,660 63,213  
Loans and Leases Receivable, Gross 67,077 65,793 64,816
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 200 169  
Financing Receivable, Recorded Investment, Current 11,815 10,881  
Loans and Leases Receivable, Gross 12,015 11,050 10,857
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 81 49  
Financing Receivable, Recorded Investment, Current 9,679 8,245  
Loans and Leases Receivable, Gross 9,760 8,294  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 119 120  
Financing Receivable, Recorded Investment, Current 2,136 2,636  
Loans and Leases Receivable, Gross 2,255 2,756  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 40 10  
Financing Receivable, Recorded Investment, Current 39,739 42,091  
Loans and Leases Receivable, Gross 39,779 42,101 $ 39,286
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 29 10  
Financing Receivable, Recorded Investment, Current 31,956 35,031  
Loans and Leases Receivable, Gross 31,985 35,041  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 8 0  
Financing Receivable, Recorded Investment, Current 3,766 3,248  
Loans and Leases Receivable, Gross 3,774 3,248  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 3 0  
Financing Receivable, Recorded Investment, Current 4,017 3,812  
Loans and Leases Receivable, Gross 4,020 3,812  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,876 1,937  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,857 1,934  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,742 1,850  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 115 84  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 75 39  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 40 45  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 19 3  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 16 3  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 3 0  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 436 452  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 436 452  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 414 428  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 22 24  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1 6  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 21 18  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 345 370  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 324 363  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 261 302  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 63 61  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 5 4  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 58 57  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 21 7  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 13 7  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 8 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 0 $ 0